I don't think that person has any power. They have no authority. According to the newspapers, the officer is complaining that no one gives him access to documents. If he were an officer of the House associated with this committee, he would have all the power. A motion ordering that documents be presented or that a witness appear before a parliamentary committee is still mostly respected. However, the Parliamentary Budget Officer currently has no power.
On April 2nd, 2012. See this statement in context.